The Linear B tablets revealed him as the principal god of Pylos; the Telemachy has preserved a memory of this when it introduces Nestor of Pylos at the great sacrifice for Poseidon on the seashore.
Burkert argues that the Linear B evidence from Pylos establishes Poseidon's primacy there, and that the Homeric Telemachy encodes this Mycenaean cultic memory in Nestor's seaside sacrifice.
, Greek Religion: Archaic and Classical, 1977thesis